There are three new types of Octopus cards: one each for children (light blue), students and adults (grey) and the elderly (dark green).

According to the Octopus Card website, if users hear three beeps when they tap their card, or if the card does not have a bracket around the last number, they should change it immediately for free. (Check your Octopus card here.) These signals will occur between October and December this year.

The card must be changed within three months after this warning, between January 20 and March 17 – otherwise they won’t work. Octopus card users can check online whether their cards need to be replaced by entering their Octopus card number.

The new cards will upgrade first-generation Octopus cards with security and technological advances. New users can shop online or continue to pay using their Octopus card at stores. Their purchases can also be tracked using the new Octopus App.